The search engine giant warned that bringing in an opt-in system with private companies managing lists on inappropriate websites would be a "mistake", reports BBC News.
TalkTalk recently introduced measures which require customers to manually confirm that they wish to access adult material. The UK government is currently reviewing plans to force all service providers to do the same.
Google's head of public policy said that the company feels strongly about protecting children online, but argued that the mandatory content filter system is not the best method for tackling the issue.
"We believe that children shouldn't be seeing pornography online. We disagree on the mechanisms. It's not that easy," she said. "There is a problem about the extent to which we deskill parents by giving them simple solutions.
"We should be making more effort than we've done in the past to make sure parents really do know the risks children face online."
The coalition's plans have drawn criticism from commentators, some of whom are likening it to censorship.
Jim Killock of the Open Rights Group said: "We welcome a consultation but default filternets are awful. They block a wide range of innocent material; and nobody should be advocating broader and simpler censorship."
BT, Sky, TalkTalk and Virgin Media joined forces to publish a code of conduct outlining plans to advise parents on restricting access to potentially harmful material back in October 2011.